When I first noticed the question, "where does the Republican River end?" in the search words, leading to this site, I thought it was a snarky queery from a sore winner after last year's presidential election for a fleeting second, then I remembered that there actually IS a Republican River in Kansas. The answer to the question is Junction City, where it meets the Smoky Hill River to become the Kansas River. It starts in Eastern Colorado, flows into Southern Nebraska, and back down into North Central Kansas until it gets to Junction City. Maybe the river needs a new name!
Republican River, near Fort Riley, Kansas